A signature block can be added to anywhere at the bottom of your Invoice template or invoice in conjunction with other additional detail blocks.
1. Go to Invoice Templates, add a block with a preset name: [signature]
The rest of the content in the text field will display under the signature line. In this example, the text: "Signature" will be displayed.
2. Alternatively, you can enter this into your invoice details as shown here
Here is how the invoice will look to clients and in the PDF. The billing contact's name will autmatically be displayed underneath.